Nope I am not confusing Iconic with popular, Go ahead name me an Iconic character that hasn't had a period of crazy mass popularity. Longevity doesn't come without popularity either. The most important component of being Iconic is popularity. Now popularity doesn't mean that you become Iconic but popularity(followed by longevity) easiest tangible measure stick for us to understand who is iconic. The harder thing to figure out is when character moves from popular to integrated in the culture and history of era. That is the subjective thing that people won't agree with it.
Tries to argue against this feels silly to me, How did Superman,Batman and Spiderman become Iconic well they had long periods of popularity where their shows, movies, comics were popular allowing the masses to know about them and they become integrated into culture then Iconic. So how do new characters become Iconic ..derp derp derp... they have long periods of popularity where their shows, movies, comics were popular allowing the masses to know about them and they become integrated into culture then Iconic. Literally the Avengers are doing what Batman and Superman did in their time, Avengers are ingrained into culture and unlike Batman and Superman they are doing it in the era of the internet so worldwide these characters are relevant to much larger base of people because technology is cheaper. Characters have short windows of mass popularity but larger initial impact and access to people. If I said the Avengers movie characters are all Iconic now I would be meet with no by a lot of people when reality is different.
That is old school ego, Is Fortnite Iconic? The reason I mention it because yeah it is,it is basically the super mario of current gen. Fortnite was release in 2017. Fortnite is Iconic because they are generation of people who thoughts matter in what is Iconic. GenXers and Boomers can all die tomorrow and they are billions of people still around. People are still running around like Superman is still the ultimate iconic thing and more kids probably recognize and find more relevance in Spongebob, Rick and Morty and Adventure time. So no I don't agree extreme popularity in this era can lead to Iconic status and the push of some of these characters in this era in media can lead to Iconic status. Anyways we will never get solid concrete agreement on what is Iconic because their level of subjectiveness to it we can all agree that Batman,Spiderman,Superman are Iconic but Wonder Woman is also consider Iconic and she doesn't fit in the same way as those characters but they are characters like Wolverine,Hulk,(and Deadpool) who have the similar metrics of those other characters and some people wouldn't consider them "Iconic".I will confidently predict that none of them will ever be iconic.